Fabrication of corrugated Ge-doped silica fibers

Abstract

Abstract:We present a method of fabricating Ge-doped SiO2 fibers with corrugations around their full circumference for a desired length in the longitudinal direction. The procedure comprises three steps: hydrogenation of Ge-doped SiO2 fibers to increase photosensitivity, recording of Bragg gratings with ultraviolet light to achieve modulation of refractive index, and chemical etching. Finite-length, radially corrugated fibers may be used as couplers. Corrugated tapered fibers are used as high energy throughput probes in scanning near-field optical microscopy. Application to reflection filter fabrication," Appl. Phys. Lett. 32(10), 647 (1978). 14. R. Stöckle, Ch. Fokas, V. Deckert, R. Zenobi, B. Sick, B. Hecht, and U. P. Wild, "High-quality near-field optical probes by tube etching," Appl. Phys. Lett. 75(2), 160-162 (1999). 15. S. K. Mondal, A. Mitra, N. Singh, S. N. Sarkar, and P. Kapur, "Optical fiber nanoprobe preparation for near-field optical microscopy by chemical etching under surface tension and capillary action," Opt. Express 17(22), 19470-19475 (2009 ©2012 Optical Society of America